如何拆分 Chef .erb 文件中的 AWS OpsWork 输出字符串。？

Question

这是我想要实现的目标：

我有一个包含以下语句的厨师 erb 文件：

<% node[:opsworks][:layers][:mylayer][:instances].each do |private_ip| %>
- "<%= private_ip %>"
<% end %>

哪个产生了输出：

"["mylayer2", {"public_dns_name"=>nil, 
"private_dns_name"=>"ip-10-0-1-157.us-west-1.compute.internal", 
"backends"=>2, "ip"=>nil, 
"private_ip"=>"10.0.1.157",     
"instance_type"=>"t2.micro", 
"status"=>"online", 
"id"=>"ba33dad5-c294-44ab-bdb5-d292e02e0658", 
"aws_instance_id"=>"i-a93bb169", 
"elastic_ip"=>nil, 
"created_at"=>"2015-08-26T11:58:03+00:00", 
"booted_at"=>"2015-08-26T11:58:45+00:00", 
"region"=>"us-west-1", "availability_zone"=>"us-west-1a",
"infrastructure_class"=>"ec2"}]"

和

"["mylayer1", {"public_dns_name"=>nil, 
"private_dns_name"=>"ip-10-0-1-253.us-west-1.compute.internal", 
"backends"=>2, "ip"=>nil, 
"private_ip"=>"10.0.1.253", 
"instance_type"=>"t2.micro", 
"status"=>"online", 
"id"=>"be6e9645-ef12-416b-9401-e7379c3f85e1", 
"aws_instance_id"=>"i-b90c9b79", 
"elastic_ip"=>nil, 
"created_at"=>"2015-08-28T08:39:42+00:00", 
"booted_at"=>"2015-08-28T08:41:05+00:00", 
"region"=>"us-west-1", 
"availability_zone"=>"us-west-1a", 
"infrastructure_class"=>"ec2"}]"

它正在生成所有实例信息，但我需要像（仅私有 IP）这样的输出：

• 10.0.1.157
• 10.0.1.253

请帮我解决这个问题。

Answer 1

正如 IRC 中提到的，实例数据看起来可能是一个哈希，因此您可能希望同时获取键和值，然后从值中获取 private_ip：

<% node[:opsworks][:layers][:mylayer][:instances].each do |instance_name, instance_data| %>
- "<%= instance_data['private_ip'] %>"
<% end %>

Answer 2

看起来您通过迭代您的实例并在您这样做时调用每个实例private_ip 让自己感到困惑。试试这个：

<% node[:opsworks][:layers][:mylayer][:instances].each do |instance| %>
- "<%= instance['private_ip'] %>"
<% end %>